Since the death of my son Izhak, I have accepted on myself to be doing four sessions in learning in my hope that they will go for his credit in Gan Eden where I hope and pray he is. But my original idea of doing lot of review does not seem to work in the sessions in math and physics. [I started this because Izhak held strongly of the idea of learning in depth (limud beiyun)]. For me it seems to work better to go one chapter forward, and then review to the beginning. Then one more chapter forward, and then again review to the very beginning. The only areas where review on that same chapter or section  works for me is in Tosphot or Rav Chaim of Brisk or the Avi Ezri of Rav Shach.